Dynamic Range Compression in the Honey Bee Auditory System toward Waggle Dance Sounds
Dynamic Range Compression in the Honey Bee Auditory System toward Waggle Dance Sounds
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DOI：
10.1371/journal.pone.0000234
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发表时间：
2007-02-21
期刊：
影响因子：
3.7
通讯作者：
Kadowaki, Tatsuhiko
中科院分区：
文献类型：
--
作者：
Tsujiuchi, Seiya;Sivan-Loukianova, Elena;Kadowaki, Tatsuhiko
蜜蜂觅食者用“摇摆舞”来告诉同伴有吸引力的食物的方向和距离。由舞者的翅膀和腹部振动产生的声音和气流被认为是重要的线索，但这些舞蹈信息的解码机制却知之甚少。为了了解蜜蜂舞蹈交流的神经机制，我们分析了天线和天线蒂Johnston’s organ （JO）的解剖结构，以及天线和JO对声刺激的力学和神经响应特征。蜜蜂JO由大约300-320个翅果组成，在花梗周围有大约48个角质层“旋钮”。每个侧棘叶包含双极性感觉神经元，具有I型和II型纤毛。触角鞭毛的机械敏感性在265-350 Hz频率的低强度刺激下特别高，而不是高强度刺激。与蚊子和果蝇相比，鞭毛的非线性响应似乎与天线神经元的结构特征有关，而与JO神经元无关。蜜蜂鞭毛是一个敏感的运动探测器，对20 nm的尖端位移响应，与雌蚊相当。此外，JO神经元具有保存包括“摇摆舞”声音在内的声刺激的频率和时间信息的能力。有趣的是，JO神经元的反应与年龄有关，这表明舞蹈交流只可能在老年觅食者之间进行。这些结果表明，成熟的蜜蜂触角和JO神经元最适合在黑暗的蜂巢中探测250-300 Hz的“摇摆舞”声音，并且通过降低鞭毛在近场跳舞中产生的机械灵敏度来获得JO神经元的充分响应。这种非线性效应导致了蜜蜂听觉系统的动态范围压缩。
Honey bee foragers use a "waggle dance'' to inform nestmates about direction and distance to locations of attractive food. The sound and air flows generated by dancer's wing and abdominal vibrations have been implicated as important cues, but the decoding mechanisms for these dance messages are poorly understood. To understand the neural mechanisms of honey bee dance communication, we analyzed the anatomy of antenna and Johnston's organ (JO) in the pedicel of the antenna, as well as the mechanical and neural response characteristics of antenna and JO to acoustic stimuli, respectively. The honey bee JO consists of about 300-320 scolopidia connected with about 48 cuticular "knobs'' around the circumference of the pedicel. Each scolopidium contains bipolar sensory neurons with both type I and II cilia. The mechanical sensitivities of the antennal flagellum are specifically high in response to low but not high intensity stimuli of 265-350 Hz frequencies. The structural characteristics of antenna but not JO neurons seem to be responsible for the non-linear responses of the flagellum in contrast to mosquito and fruit fly. The honey bee flagellum is a sensitive movement detector responding to 20 nm tip displacement, which is comparable to female mosquito. Furthermore, the JO neurons have the ability to preserve both frequency and temporal information of acoustic stimuli including the "waggle dance'' sound. Intriguingly, the response of JO neurons was found to be age-dependent, demonstrating that the dance communication is only possible between aged foragers. These results suggest that the matured honey bee antennae and JO neurons are best tuned to detect 250-300 Hz sound generated during "waggle dance'' from the distance in a dark hive, and that sufficient responses of the JO neurons are obtained by reducing the mechanical sensitivity of the flagellum in a near-field of dancer. This nonlinear effect brings about dynamic range compression in the honey bee auditory system.